Title :
A New Approach to Achieve High Spectral Efficiency in Wavelength-Time OCDMA Network Transmission
Author :
Garba, Aminata Amadou ; Bajcsy, Jan
Author_Institution :
Dept. of Electr. & Comput. Eng., McGill Univ., Montreal, Que.
Abstract :
We design a new wavelength-time optical code-division multiple-access (OCDMA) modulation scheme that does not use spreading sequences for information transmission, i.e., the spreading length is N=1. The proposed transmitter sends (error-control) coded data directly through the optical channel and exploits a probabilistic method to reduce the amount of multiuser interference. Simulation results show that by using turbo codes, Reed-Solomon codes, and soft-decision demodulation, the proposed OCDMA scheme can support hundreds of active users at target bit-error rate =10-9. Furthermore, the achieved spectral efficiency of 0.740 bits per channel use is almost twice as large as the best previous OCDMA results
Keywords :
Reed-Solomon codes; code division multiple access; demodulation; error statistics; optical fibre networks; optical modulation; optical transmitters; probability; telecommunication channels; turbo codes; OCDMA modulation; Reed-Solomon codes; bit-error rate; multiuser interference; optical channel; optical code-division multiple-access; optical transmitter; probabilistic method; soft-decision demodulation; spectral efficiency; turbo codes; wavelength-time network transmission; Bit error rate; Demodulation; Interference; Modulation coding; Multiaccess communication; Optical design; Optical modulation; Optical transmitters; Reed-Solomon codes; Turbo codes; Soft-decision demodulation; spectral efficiency; wavelength-time optical code-division multiple-access (OCDMA);
Journal_Title :
Photonics Technology Letters, IEEE
DOI :
10.1109/LPT.2006.889104
